PLT OF SMA PVT ACFT RPTS AN UNEVEN RWY INTXN CAUSING A ROUGH TKOF.

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AT NIAGARA FALLS; NY; KIAG; RWY 28L ASSIGNED FOR TKOF. THE SMA ACFT HAS A PROP CLRNC OF ONLY 8 1/4 INCHS. 28L CROSSES RWY 6/24 APPROX 1100 FT FROM THE TKOF END OF 28L. RWY 6/24 IS CRESTED WITH A TOPOGRAPHY SO THAT THE ACFT ON IT'S TKOF ROLL ON 28L AS IT CROSS 6/24 COMMENCES FIRST A DOWN ROLL; THEN UP TO THE CREST AND DOWN THE OTHER SIDE; AND THEN UP TO THE LEVEL OF 28L. THE SMA ACFT HAD NOT QUITE REACHED FLYING SPD WHEN IT COMMENCED TO CROSS THE UNDULATING 6/24 RWY SURFACE. THE SMA ACFT TKOF WAS DISTURBED SO THAT IT FIRST PITCHED UP AND THEN DOWN; DESTROYING THE LIFT OF THE LAMINAR FLOW WINGS. THE ACFT STARTED TO PORPOISE WHICH WAS CTLED AFTER IT REACHED THE FAR SIDE OF THE CROSS RWY. THE SMA ACFT PROP TIPS DID NOT CONTACT THE RWY; BUT THEY MUST HAVE BEEN MIGHTY CLOSE. AFTER TURN OUT; THE TWR CTLR WAS ADVISED OF THE FORGOING EXPERIENCE. THE CTLR RESPONDED 'OH YES; IT HAS BEEN LIKE THAT FOR YRS.' HE MADE NO RESPONSE TO THE PLT'S SUGGESTION THAT THE CTLR SHOULD HAVE ADVISED THE PLT OF THE CONDITION; AND OFFERED AN OPPORTUNITY TO USE 28R AS AN ALTERNATE. 28R DOES NOT CROSS ANOTHER RWY. TFC WAS VERY LIGHT AT THE TIME. WHEN THE TWR CTLR WAS ASKED WHO SHOULD BE ADVISED THAT THE CONDITION WAS DANGEROUS; HE SUGGESTED A LETTER TO THE ARPT AUTHORITY. HE WAS ADVISED THAT THIS RPT TO ASRS WOULD BE MADE IN THE INTEREST OF FLT SAFETY. NO FAR VIOLATIONS INVOLVED.